Missing binaries and hanging setup on HypriotOS

Hi!

First of all: Great work!

I was using pivpn for a while. Now i want to move my complete rpi infrastructure to docker. Iam a big fan of HypriotOS for rpi. (https://blog.hypriot.com/downloads/) This os allows me to run docker out of the box on my rpi. Currently iam using HypriotOS (Debian GNU/Linux 8)

Unfornatelly it does not work with your install script (curl -s -L https://bit.ly/2vpfRx9 | sudo bash).

The first thing is: hypriot is very minimalistic. For example i have to install lsof befor using your script by using "apt-get install lsof". It would be nice if your script could check if the binary exists.

The second thing is: the script seems to be hanging after i have typed in the port number.

If i have the time i will provide you more informations about the issue. But i have no idea where and how to start the debugging. Iam not so experienced in writing complex sh-scripts.